Dave Hachadorian, K6LL, wrote:
>As a last resort, you can tape pretty much any old electret
>element to the mic boom and run a separate mic line from the
>element. Mouser has a good selection of electret elements, many
>under $5. My CM500 microphone element failed, and I replaced it
>with an
Tom,
I do not have the specifications for the Koss SB40, but all the ad
statements say it has a dynamic microphone element.
What happens if you turn off the bias? If you get no audio, then it is
an electret element, but if you do get audio out of it, it is dynamic.
Operating a dynamic
As a general rule, if you measure the DC resistance at the connector on
the mike and it is less than 2K ohms, it is likely dynamic. If it is
10K or more, it is likely an electret element.If it is near infinity
then likely there is a DC blocking capacitor in the circuit. The R
values
I have been very happy with the Koss SB-45 and get great audio reports
with it. I have found the ear
phones comfortable.
Ken WA8JXM
On 11/5/15 9:41 PM, Dave Hachadorian wrote:
The SB45 headset has an electret element, but it is not the same
comfortable headphone arrangement as the CM-500.
The Koss SB40 has a dynamic mic instead of the electret in the Yamaha CM500.
Koss does seem to make the CM500, mine says “Koss” on the plug. But the dynamic
mic in the SB40 is a step down in quality from the electret in the CM500.
If you have mic bias on, you’ll need to turn that off for the
My CM500 was looking kinda 'ratty' after 4 yrs with ear cushions
starting to shed material. Saw where someone said that Koss actually
makes the CM500 for Yamaha so ordered the SB40 as replacement.
First trial was CQ WW SSB a couple of weekends ago. Rig had been
sitting in the closet for several
Message-
From: cx...@4email.net
Sent: Thursday, November 5, 2015 6:40 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] K3 Yamaha CM500 vs Koss SB40
My CM500 was looking kinda 'ratty' after 4 yrs with ear cushions
starting to shed material. Saw where someone said that Koss
actually
makes
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